Of, relating to, or believing in the doctrine of heteroousia; characterized by the belief that God the Father and Son have different essences.
From heteroousia plus -ous (adjectival suffix), forming an adjective to describe something pertaining to or characterized by the heteroousia doctrine.
If you called someone's beliefs 'heteroousious' in 325 AD after the Council of Nicaea, you were basically calling them a heretic—it was the theological equivalent of a scarlet letter that could ruin your ecclesiastical career!
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